Ground state phase diagram and magnetoconductance of a one-dimensional Hubbard superlattice at half-filling

Details Ground state phase diagram and magnetoconductance of a one-dimensional Hubbard superlattice at half-filling Ground state phase diagram and magnetoconductance of a one-dimensional Hubbard superlattice at half-filling

2007-06-05

arxiv.org/abs/0706.0582v2

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 13 figures. to be published in Phys. Rev. B, vol. 75, Issue 23 (tentative)

Scientific paper

10.1103/PhysRevB.75.235117

We have studied a one dimensional Hubbard superlattice with different Coulomb correlations at alternating sites for a half-filled band. Mean field calculations based on the Hartree-Fock approximation together with a real space renormalization group technique were used to study the ground state of the system. The phase diagrams obtained in these approaches agree with each other from the weak to the intermediate coupling regime. The mean field results show very quick convergence with system size. The renormalization group results indicate a spatial modulation of local moments that was identified in some previous work. Also we have studied the magnetoconductance of such superlattices which reveals several interesting points.

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